Fast National ratings for Sunday, Sept. 9, 2012Peyton Manning's return to the NFL brought big ratings for NBC's first "Sunday Night Football" telecast of the season. FOX also got a big boost from a late-afternoon game that bled into primetime.NBC's numbers will likely go up in the final nationals, but currently the network stands at 20.1 million viewers and a 12.1 rating/19 share in households for the night (the game's metered-market rating of 18.0/29 also was the highest ever for a regular-season "SNF" game). FOX took second with 9.6 million viewers and a 5.8/9, beating out CBS (7.2 million, 4.7/7). ABC was a distant fourth with 2.8 million viewers and a 1.9/3.NBC dominated the adults 18-49 demographic as well with a 7.8 rating. FOX scored an NFL-boosted 4.1 in the demo. CBS drew a 1.5 and ABC a 0.7....